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Sedans Cadillac CTS/CTS-V 2009 CTS
231 messages, Last post on Nov 23, 2009 at 1:06 PM
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Replying to: blackcadillac (Mar 10, 2009 5:35 am) |
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Replying to: blackcadillac (Mar 10, 2009 5:35 am) I have had 4 Eldorados and 2 CTSs and all got the EPA MPG with this Instant MPG test and they all would show 60-70 MPG after taking foot off the gas and coasting. More miles, summer gas, etc, will help, but it sounds like you are so far below the highway EPA, that something is wrong. After this test, you have some facts to discuss with the dealer. Talking with the dealer about average MPG and city MPG, isn't going to get much done. You could have something weird, like a brake rubbing, especially if it doesn't get good MPG on instant when coasting. Check your tire pressure. |
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Replying to: blackcadillac (Mar 10, 2009 5:35 am) |
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Replying to: artmbgolf (Mar 13, 2009 9:57 am) And,.. yes going down hill coasting it would shoot up to 70MPG on the instant read out. Tire pressure seems in line. I'm still getting the same mpg. Nothing I do seems to change. If I drive as conservative as possible, the best is 13 MPG. If I get on it and use the sport mode, I'm looking at 10 or 11 MPG. I'm going to take this baby back to the dealer again. I have notice other post regarding rough idle. I also have the same issue. For a 40k plus car, I am shocked how this thing sounds. I forget about it right up until I get out of the car while it's running. It always makes me double take and think something is wrong. I don't mean to whine..... I think the car is sharp and like a lot of the internal features, but I'm beginning to think I should have done more research before buying. I'll also try to find a gas station that isn't 10% ethonol. I haven't been paying attention to that. Thanks for all the comments and suggestions. best, -s |
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Replying to: blackcadillac (Mar 15, 2009 6:57 pm) It does sound like something is not right with your car. Plenty of others have reported expected EPA MPG. Stop and go driving can be bad, but highway cruise should be better than you are getting. Sport mode would hurt gas mileage. |
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Replying to: blackcadillac (Mar 15, 2009 6:57 pm)
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Replying to: temj12 (Mar 16, 2009 9:05 am) |
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Replying to: blackcadillac (Mar 10, 2009 5:35 am) |
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The EPA estimate is for average mileage under city or highway conditions. Instant mileage is only a picture of mileage at one instant in time and should not be used in any mileage calculations. It can be manipulated too easily. When I fill up my CTS, I zero the average mileage on the DIC and drive for at least a tankfull, before checking my average. If I'm taking a long highway trip I don't check the mileage until the entire trip is complete. Most of the time I will go at least a month and multiple fillups before checking mileage. It gives you the true picture of your cars performance over a period of time. As I've said before, engines need break in time before they give the best mileage. If you have under 10K miles, don't panic. Drive the car and enjoy it, you didn't buy it solely for the mileage did you?
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Replying to: temj12 (Mar 16, 2009 9:05 am) I do have a 3.6 DI engine. Performance? When I first took the car back, the dealer set me up with CTS 09 263HP RWD as loaner and I noticed that it seemed more responsive (peppier). Besides the MPG, this is also an issue for me. I'm basically following the dealers initial advice and adding more miles to see if any thing changes. I manually calculate my MPG after every tank of gas. It's pretty much a tank a week for me. It's great to hear what others are experiencing and thoughts on causes. This will all be helpful when I discuss my issues with the service dude in the future. Thanks all! |
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